從@RequestScoped類訪問@SessionScoped類？

我有一個類是@SessionScoped，另一個類是@RequestScoped。我正在嘗試訪問@RequestScoped類中的SessionScoped類。我想簡單地使用CDI，通過將@SessionScoped類注入@RequestScoped類中的變量，但只要我試圖通過該變量訪問參數，我最終得到錯誤。從@RequestScoped類訪問@SessionScoped類？

如何從@RequestScoped類訪問@SessionScoped類的最佳方式是？

的SessionScoped類：

@ManagedBean(name = "globalBean", eager = true) 
@Named 
@SessionScoped 
public class GlobalBean implements Serializable { 
    private String language; 

    public String getLanguage() { 
     return language; 
    } 

    public void setLanguage(String language) { 
     this.language = language; 
    } 
}

的RequestScoped類：

@Named 
@RequestScoped 
public class TopMenuBean implements Serializable { 
    //@Inject 
    @ManagedProperty(value = "#{globalBean}") 
    private GlobalBean global; 

    public TopMenuBean() { 
     this.global.setLanguage("en"); 
    } 
}

錯誤：

20:23:32,214 SEVERE [javax.enterprise.resource.webcontainer.jsf.application] (default task-17) Error Rendering View[/index.xhtml]: java.lang.NullPointerException 
    at com.mycategory.myprogram.TopMenuBean.<init>(TopMenuBean.java:84) [classes:] 
    at com.mycategory.myprogram.TopMenuBean$Proxy$_$$_WeldClientProxy.<init>(Unknown Source) [classes:] 
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) [rt.jar:1.8.0_11] 
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) [rt.jar:1.8.0_11] 
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) [rt.jar:1.8.0_11] 
    at java.lang.reflect.Constructor.newInstance(Constructor.java:408) [rt.jar:1.8.0_11] 
    at java.lang.Class.newInstance(Class.java:433) [rt.jar:1.8.0_11] 
    at org.jboss.weld.security.NewInstanceAction.run(NewInstanceAction.java:33) [weld-core-impl-2.1.2.Final.jar:2014-01-09 09:23] 
    at java.security.AccessController.doPrivileged(Native Method) [rt.jar:1.8.0_11] 
    at org.jboss.weld.bean.proxy.ProxyFactory.create(ProxyFactory.java:282) [weld-core-impl-2.1.2.Final.jar:2014-01-09 09:23] 
    at org.jboss.weld.bean.proxy.ClientProxyFactory.create(ClientProxyFactory.java:111) [weld-core-impl-2.1.2.Final.jar:2014-01-09 09:23] 
    at org.jboss.weld.bean.proxy.ClientProxyProvider.createClientProxy(ClientProxyProvider.java:180) [weld-core-impl-2.1.2.Final.jar:2014-01-09 09:23] 
    at org.jboss.weld.bean.proxy.ClientProxyProvider.createClientProxy(ClientProxyProvider.java:170) [weld-core-impl-2.1.2.Final.jar:2014-01-09 09:23] 
    at org.jboss.weld.bean.proxy.ClientProxyProvider.access$100(ClientProxyProvider.java:45) [weld-core-impl-2.1.2.Final.jar:2014-01-09 09:23] 
    at org.jboss.weld.bean.proxy.ClientProxyProvider$CreateClientProxy.load(ClientProxyProvider.java:56) [weld-core-impl-2.1.2.Final.jar:2014-01-09 09:23] 
    at org.jboss.weld.bean.proxy.ClientProxyProvider$CreateClientProxy.load(ClientProxyProvider.java:52) [weld-core-impl-2.1.2.Final.jar:2014-01-09 09:23] 
    at com.google.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3524) 
    at com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2317) 
    at com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2280) 
    at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2195) 
    at com.google.common.cache.LocalCache.get(LocalCache.java:3934) 
    at com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:3938) 
    at com.google.common.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:4821) 
    at org.jboss.weld.util.cache.LoadingCacheUtils.getCacheValue(LoadingCacheUtils.java:52) [weld-core-impl-2.1.2.Final.jar:2014-01-09 09:23] 
    at org.jboss.weld.util.cache.LoadingCacheUtils.getCastCacheValue(LoadingCacheUtils.java:80) [weld-core-impl-2.1.2.Final.jar:2014-01-09 09:23] 
    at org.jboss.weld.bean.proxy.ClientProxyProvider.getClientProxy(ClientProxyProvider.java:186) [weld-core-impl-2.1.2.Final.jar:2014-01-09 09:23] 
    at org.jboss.weld.el.AbstractWeldELResolver.lookup(AbstractWeldELResolver.java:110) [weld-core-impl-2.1.2.Final.jar:2014-01-09 09:23] 
    at org.jboss.weld.el.AbstractWeldELResolver.getValue(AbstractWeldELResolver.java:91) [weld-core-impl-2.1.2.Final.jar:2014-01-09 09:23] 
    at org.jboss.as.jsf.injection.weld.ForwardingELResolver.getValue(ForwardingELResolver.java:46) [wildfly-jsf-injection-8.1.0.Final.jar:8.1.0.Final] 
    at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:188) [jboss-el-api_3.0_spec-1.0.3.Final.jar:1.0.3.Final] 
    at com.sun.faces.el.DemuxCompositeELResolver._getValue(DemuxCompositeELResolver.java:176) [jsf-impl-2.2.6-jbossorg-4.jar:] 
    at com.sun.faces.el.DemuxCompositeELResolver.getValue(DemuxCompositeELResolver.java:203) [jsf-impl-2.2.6-jbossorg-4.jar:] 
    at com.sun.el.parser.AstIdentifier.getValue(AstIdentifier.java:116) [javax.el-3.0.0.jar:] 
    at com.sun.el.parser.AstValue.getBase(AstValue.java:151) [javax.el-3.0.0.jar:] 
    at com.sun.el.parser.AstValue.getValue(AstValue.java:200) [javax.el-3.0.0.jar:] 
    at com.sun.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:226) [javax.el-3.0.0.jar:] 
    at org.jboss.weld.el.WeldValueExpression.getValue(WeldValueExpression.java:50) [weld-core-impl-2.1.2.Final.jar:2014-01-09 09:23] 
    at org.jboss.weld.el.WeldValueExpression.getValue(WeldValueExpression.java:50) [weld-core-impl-2.1.2.Final.jar:2014-01-09 09:23] 
    at com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:109) [jsf-impl-2.2.6-jbossorg-4.jar:] 
    at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:194) [jboss-jsf-api_2.2_spec-2.2.6.jar:2.2.6] 
    at org.primefaces.component.tabmenu.TabMenu.getModel(TabMenu.java:84) [primefaces-5.1.jar:5.1] 
    at org.primefaces.component.menu.BaseMenuRenderer.encodeEnd(BaseMenuRenderer.java:103) [primefaces-5.1.jar:5.1] 
    at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:919) [jboss-jsf-api_2.2_spec-2.2.6.jar:2.2.6] 
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1864) [jboss-jsf-api_2.2_spec-2.2.6.jar:2.2.6] 
    at javax.faces.render.Renderer.encodeChildren(Renderer.java:176) [jboss-jsf-api_2.2_spec-2.2.6.jar:2.2.6] 
    at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:889) [jboss-jsf-api_2.2_spec-2.2.6.jar:2.2.6] 
    at org.primefaces.renderkit.CoreRenderer.renderChild(CoreRenderer.java:79) [primefaces-5.1.jar:5.1] 
    at org.primefaces.renderkit.CoreRenderer.renderChildren(CoreRenderer.java:66) [primefaces-5.1.jar:5.1] 
    at org.primefaces.component.panelgrid.PanelGridRenderer.encodeRow(PanelGridRenderer.java:187) [primefaces-5.1.jar:5.1] 
    at org.primefaces.component.panelgrid.PanelGridRenderer.encodeStaticBody(PanelGridRenderer.java:147) [primefaces-5.1.jar:5.1] 
    at org.primefaces.component.panelgrid.PanelGridRenderer.encodeTableBody(PanelGridRenderer.java:100) [primefaces-5.1.jar:5.1] 
    at org.primefaces.component.panelgrid.PanelGridRenderer.encodeTableLayout(PanelGridRenderer.java:65) [primefaces-5.1.jar:5.1] 
    at org.primefaces.component.panelgrid.PanelGridRenderer.encodeEnd(PanelGridRenderer.java:37) [primefaces-5.1.jar:5.1] 
    at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:919) [jboss-jsf-api_2.2_spec-2.2.6.jar:2.2.6] 
    at org.primefaces.renderkit.CoreRenderer.renderChild(CoreRenderer.java:83) [primefaces-5.1.jar:5.1] 
    at org.primefaces.renderkit.CoreRenderer.renderChildren(CoreRenderer.java:66) [primefaces-5.1.jar:5.1] 
    at org.primefaces.component.layout.LayoutUnitRenderer.encodeEnd(LayoutUnitRenderer.java:49) [primefaces-5.1.jar:5.1] 
    at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:919) [jboss-jsf-api_2.2_spec-2.2.6.jar:2.2.6] 
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1864) [jboss-jsf-api_2.2_spec-2.2.6.jar:2.2.6] 
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1860) [jboss-jsf-api_2.2_spec-2.2.6.jar:2.2.6] 
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1860) [jboss-jsf-api_2.2_spec-2.2.6.jar:2.2.6] 
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1860) [jboss-jsf-api_2.2_spec-2.2.6.jar:2.2.6] 
    at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:461) [jsf-impl-2.2.6-jbossorg-4.jar:] 
    at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:133) [jsf-impl-2.2.6-jbossorg-4.jar:] 
    at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:337) [jboss-jsf-api_2.2_spec-2.2.6.jar:2.2.6] 
    at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:337) [jboss-jsf-api_2.2_spec-2.2.6.jar:2.2.6] 
    at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:120) [jsf-impl-2.2.6-jbossorg-4.jar:] 
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) [jsf-impl-2.2.6-jbossorg-4.jar:] 
    at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:219) [jsf-impl-2.2.6-jbossorg-4.jar:] 
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:647) [jboss-jsf-api_2.2_spec-2.2.6.jar:2.2.6] 
    at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:85) [undertow-servlet-1.0.15.Final.jar:1.0.15.Final] 
    at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:61) [undertow-servlet-1.0.15.Final.jar:1.0.15.Final] 
    at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36) [undertow-servlet-1.0.15.Final.jar:1.0.15.Final] 
    at org.wildfly.extension.undertow.security.SecurityContextAssociationHandler.handleRequest(SecurityContextAssociationHandler.java:78) 
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:25) [undertow-core-1.0.15.Final.jar:1.0.15.Final] 
    at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:113) [undertow-servlet-1.0.15.Final.jar:1.0.15.Final] 
    at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:56) [undertow-servlet-1.0.15.Final.jar:1.0.15.Final] 
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:25) [undertow-core-1.0.15.Final.jar:1.0.15.Final] 
    at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:45) [undertow-core-1.0.15.Final.jar:1.0.15.Final] 
    at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:61) [undertow-servlet-1.0.15.Final.jar:1.0.15.Final] 
    at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:58) [undertow-core-1.0.15.Final.jar:1.0.15.Final] 
    at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:70) [undertow-servlet-1.0.15.Final.jar:1.0.15.Final] 
    at io.undertow.security.handlers.SecurityInitialHandler.handleRequest(SecurityInitialHandler.java:76) [undertow-core-1.0.15.Final.jar:1.0.15.Final] 
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:25) [undertow-core-1.0.15.Final.jar:1.0.15.Final] 
    at org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61) 
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:25) [undertow-core-1.0.15.Final.jar:1.0.15.Final] 
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:25) [undertow-core-1.0.15.Final.jar:1.0.15.Final] 
    at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:240) [undertow-servlet-1.0.15.Final.jar:1.0.15.Final] 
    at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:227) [undertow-servlet-1.0.15.Final.jar:1.0.15.Final] 
    at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:73) [undertow-servlet-1.0.15.Final.jar:1.0.15.Final] 
    at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:146) [undertow-servlet-1.0.15.Final.jar:1.0.15.Final] 
    at io.undertow.server.Connectors.executeRootHandler(Connectors.java:177) [undertow-core-1.0.15.Final.jar:1.0.15.Final] 
    at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:727) [undertow-core-1.0.15.Final.jar:1.0.15.Final] 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [rt.jar:1.8.0_11] 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [rt.jar:1.8.0_11] 
    at java.lang.Thread.run(Thread.java:745) [rt.jar:1.8.0_11] 

20:23:32,227 ERROR [io.undertow.request] (default task-17) UT005023: Exception handling request to /myprogram/index.jsf: javax.servlet.ServletException 
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:659) [jboss-jsf-api_2.2_spec-2.2.6.jar:2.2.6] 
    at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:85) [undertow-servlet-1.0.15.Final.jar:1.0.15.Final] 
    at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:61) [undertow-servlet-1.0.15.Final.jar:1.0.15.Final] 
    at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36) [undertow-servlet-1.0.15.Final.jar:1.0.15.Final] 
    at org.wildfly.extension.undertow.security.SecurityContextAssociationHandler.handleRequest(SecurityContextAssociationHandler.java:78) 
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:25) [undertow-core-1.0.15.Final.jar:1.0.15.Final] 
    at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:113) [undertow-servlet-1.0.15.Final.jar:1.0.15.Final] 
    at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:56) [undertow-servlet-1.0.15.Final.jar:1.0.15.Final] 
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:25) [undertow-core-1.0.15.Final.jar:1.0.15.Final] 
    at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:45) [undertow-core-1.0.15.Final.jar:1.0.15.Final] 
    at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:61) [undertow-servlet-1.0.15.Final.jar:1.0.15.Final] 
    at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:58) [undertow-core-1.0.15.Final.jar:1.0.15.Final] 
    at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:70) [undertow-servlet-1.0.15.Final.jar:1.0.15.Final] 
    at io.undertow.security.handlers.SecurityInitialHandler.handleRequest(SecurityInitialHandler.java:76) [undertow-core-1.0.15.Final.jar:1.0.15.Final] 
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:25) [undertow-core-1.0.15.Final.jar:1.0.15.Final] 
    at org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61) 
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:25) [undertow-core-1.0.15.Final.jar:1.0.15.Final] 
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:25) [undertow-core-1.0.15.Final.jar:1.0.15.Final] 
    at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:240) [undertow-servlet-1.0.15.Final.jar:1.0.15.Final] 
    at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:227) [undertow-servlet-1.0.15.Final.jar:1.0.15.Final] 
    at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:73) [undertow-servlet-1.0.15.Final.jar:1.0.15.Final] 
    at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:146) [undertow-servlet-1.0.15.Final.jar:1.0.15.Final] 
    at io.undertow.server.Connectors.executeRootHandler(Connectors.java:177) [undertow-core-1.0.15.Final.jar:1.0.15.Final] 
    at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:727) [undertow-core-1.0.15.Final.jar:1.0.15.Final] 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [rt.jar:1.8.0_11] 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [rt.jar:1.8.0_11] 
    at java.lang.Thread.run(Thread.java:745) [rt.jar:1.8.0_11] 
Caused by: java.lang.NullPointerException 
    at com.mycategory.myprogram.TopMenuBean.<init>(TopMenuBean.java:84) [classes:] 
    at com.mycategory.myprogram.TopMenuBean$Proxy$_$$_WeldClientProxy.<init>(Unknown Source) [classes:] 
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) [rt.jar:1.8.0_11] 
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) [rt.jar:1.8.0_11] 
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) [rt.jar:1.8.0_11] 
    at java.lang.reflect.Constructor.newInstance(Constructor.java:408) [rt.jar:1.8.0_11] 
    at java.lang.Class.newInstance(Class.java:433) [rt.jar:1.8.0_11] 
    at org.jboss.weld.security.NewInstanceAction.run(NewInstanceAction.java:33) [weld-core-impl-2.1.2.Final.jar:2014-01-09 09:23] 
    at java.security.AccessController.doPrivileged(Native Method) [rt.jar:1.8.0_11] 
    at org.jboss.weld.bean.proxy.ProxyFactory.create(ProxyFactory.java:282) [weld-core-impl-2.1.2.Final.jar:2014-01-09 09:23] 
    at org.jboss.weld.bean.proxy.ClientProxyFactory.create(ClientProxyFactory.java:111) [weld-core-impl-2.1.2.Final.jar:2014-01-09 09:23] 
    at org.jboss.weld.bean.proxy.ClientProxyProvider.createClientProxy(ClientProxyProvider.java:180) [weld-core-impl-2.1.2.Final.jar:2014-01-09 09:23] 
    at org.jboss.weld.bean.proxy.ClientProxyProvider.createClientProxy(ClientProxyProvider.java:170) [weld-core-impl-2.1.2.Final.jar:2014-01-09 09:23] 
    at org.jboss.weld.bean.proxy.ClientProxyProvider.access$100(ClientProxyProvider.java:45) [weld-core-impl-2.1.2.Final.jar:2014-01-09 09:23] 
    at org.jboss.weld.bean.proxy.ClientProxyProvider$CreateClientProxy.load(ClientProxyProvider.java:56) [weld-core-impl-2.1.2.Final.jar:2014-01-09 09:23] 
    at org.jboss.weld.bean.proxy.ClientProxyProvider$CreateClientProxy.load(ClientProxyProvider.java:52) [weld-core-impl-2.1.2.Final.jar:2014-01-09 09:23] 
    at com.google.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3524) 
    at com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2317) 
    at com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2280) 
    at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2195) 
    at com.google.common.cache.LocalCache.get(LocalCache.java:3934) 
    at com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:3938) 
    at com.google.common.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:4821) 
    at org.jboss.weld.util.cache.LoadingCacheUtils.getCacheValue(LoadingCacheUtils.java:52) [weld-core-impl-2.1.2.Final.jar:2014-01-09 09:23] 
    at org.jboss.weld.util.cache.LoadingCacheUtils.getCastCacheValue(LoadingCacheUtils.java:80) [weld-core-impl-2.1.2.Final.jar:2014-01-09 09:23] 
    at org.jboss.weld.bean.proxy.ClientProxyProvider.getClientProxy(ClientProxyProvider.java:186) [weld-core-impl-2.1.2.Final.jar:2014-01-09 09:23] 
    at org.jboss.weld.el.AbstractWeldELResolver.lookup(AbstractWeldELResolver.java:110) [weld-core-impl-2.1.2.Final.jar:2014-01-09 09:23] 
    at org.jboss.weld.el.AbstractWeldELResolver.getValue(AbstractWeldELResolver.java:91) [weld-core-impl-2.1.2.Final.jar:2014-01-09 09:23] 
    at org.jboss.as.jsf.injection.weld.ForwardingELResolver.getValue(ForwardingELResolver.java:46) [wildfly-jsf-injection-8.1.0.Final.jar:8.1.0.Final] 
    at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:188) [jboss-el-api_3.0_spec-1.0.3.Final.jar:1.0.3.Final] 
    at com.sun.faces.el.DemuxCompositeELResolver._getValue(DemuxCompositeELResolver.java:176) [jsf-impl-2.2.6-jbossorg-4.jar:] 
    at com.sun.faces.el.DemuxCompositeELResolver.getValue(DemuxCompositeELResolver.java:203) [jsf-impl-2.2.6-jbossorg-4.jar:] 
    at com.sun.el.parser.AstIdentifier.getValue(AstIdentifier.java:116) [javax.el-3.0.0.jar:] 
    at com.sun.el.parser.AstValue.getBase(AstValue.java:151) [javax.el-3.0.0.jar:] 
    at com.sun.el.parser.AstValue.getValue(AstValue.java:200) [javax.el-3.0.0.jar:] 
    at com.sun.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:226) [javax.el-3.0.0.jar:] 
    at org.jboss.weld.el.WeldValueExpression.getValue(WeldValueExpression.java:50) [weld-core-impl-2.1.2.Final.jar:2014-01-09 09:23] 
    at org.jboss.weld.el.WeldValueExpression.getValue(WeldValueExpression.java:50) [weld-core-impl-2.1.2.Final.jar:2014-01-09 09:23] 
    at com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:109) [jsf-impl-2.2.6-jbossorg-4.jar:] 
    at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:194) [jboss-jsf-api_2.2_spec-2.2.6.jar:2.2.6] 
    at org.primefaces.component.tabmenu.TabMenu.getModel(TabMenu.java:84) [primefaces-5.1.jar:5.1] 
    at org.primefaces.component.menu.BaseMenuRenderer.encodeEnd(BaseMenuRenderer.java:103) [primefaces-5.1.jar:5.1] 
    at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:919) [jboss-jsf-api_2.2_spec-2.2.6.jar:2.2.6] 
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1864) [jboss-jsf-api_2.2_spec-2.2.6.jar:2.2.6] 
    at javax.faces.render.Renderer.encodeChildren(Renderer.java:176) [jboss-jsf-api_2.2_spec-2.2.6.jar:2.2.6] 
    at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:889) [jboss-jsf-api_2.2_spec-2.2.6.jar:2.2.6] 
    at org.primefaces.renderkit.CoreRenderer.renderChild(CoreRenderer.java:79) [primefaces-5.1.jar:5.1] 
    at org.primefaces.renderkit.CoreRenderer.renderChildren(CoreRenderer.java:66) [primefaces-5.1.jar:5.1] 
    at org.primefaces.component.panelgrid.PanelGridRenderer.encodeRow(PanelGridRenderer.java:187) [primefaces-5.1.jar:5.1] 
    at org.primefaces.component.panelgrid.PanelGridRenderer.encodeStaticBody(PanelGridRenderer.java:147) [primefaces-5.1.jar:5.1] 
    at org.primefaces.component.panelgrid.PanelGridRenderer.encodeTableBody(PanelGridRenderer.java:100) [primefaces-5.1.jar:5.1] 
    at org.primefaces.component.panelgrid.PanelGridRenderer.encodeTableLayout(PanelGridRenderer.java:65) [primefaces-5.1.jar:5.1] 
    at org.primefaces.component.panelgrid.PanelGridRenderer.encodeEnd(PanelGridRenderer.java:37) [primefaces-5.1.jar:5.1] 
    at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:919) [jboss-jsf-api_2.2_spec-2.2.6.jar:2.2.6] 
    at org.primefaces.renderkit.CoreRenderer.renderChild(CoreRenderer.java:83) [primefaces-5.1.jar:5.1] 
    at org.primefaces.renderkit.CoreRenderer.renderChildren(CoreRenderer.java:66) [primefaces-5.1.jar:5.1] 
    at org.primefaces.component.layout.LayoutUnitRenderer.encodeEnd(LayoutUnitRenderer.java:49) [primefaces-5.1.jar:5.1] 
    at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:919) [jboss-jsf-api_2.2_spec-2.2.6.jar:2.2.6] 
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1864) [jboss-jsf-api_2.2_spec-2.2.6.jar:2.2.6] 
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1860) [jboss-jsf-api_2.2_spec-2.2.6.jar:2.2.6] 
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1860) [jboss-jsf-api_2.2_spec-2.2.6.jar:2.2.6] 
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1860) [jboss-jsf-api_2.2_spec-2.2.6.jar:2.2.6] 
    at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:461) [jsf-impl-2.2.6-jbossorg-4.jar:] 
    at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:133) [jsf-impl-2.2.6-jbossorg-4.jar:] 
    at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:337) [jboss-jsf-api_2.2_spec-2.2.6.jar:2.2.6] 
    at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:337) [jboss-jsf-api_2.2_spec-2.2.6.jar:2.2.6] 
    at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:120) [jsf-impl-2.2.6-jbossorg-4.jar:] 
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) [jsf-impl-2.2.6-jbossorg-4.jar:] 
    at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:219) [jsf-impl-2.2.6-jbossorg-4.jar:] 
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:647) [jboss-jsf-api_2.2_spec-2.2.6.jar:2.2.6] 
    ... 26 more

來源

2014-12-13 Socrates

您在第一代碼片段混合註釋（ '@ ManagedBean'和'@命名'）。使它們成爲JSF託管的bean或CDI託管的bean。 '@ ManagedProperty'只適用於JSF託管的bean內部。如果碰巧使用CDI，則使用'@ Inject'註釋注入目標會話作用域bean。最後，'eager = true'僅適用於應用程序範圍的JSF託管的bean。因此，任何其他豆的存在都被忽略。 – Tiny 2014-12-13 15:16:08

我知道我在混合JSF和CDI，不過我在下面的帖子中有一個更好的理解。實際上，儘管我更喜歡使用CDI，但將'@Inject'放置在'Global GlobalBean global'上'也會導致錯誤！我怎樣才能使用@Inject進行注入？ – Socrates 2014-12-13 16:16:48

「@ Inject」導致什麼錯誤？在您的代碼中首先擺脫以@ @ ManagedXXX開始的所有內容 – kolossus 2014-12-13 21:54:46

[解決]：

混合JSF（@ManagedBean）和CDI（@Named）不是我的意圖。我更喜歡專注於CDI，並建立了一個工作示例，我想在這裏發佈那些出現同樣問題的靈魂。一個很快的事情，很長一段時間是我的錯誤之一：

不要嘗試訪問構造函數內的注入變量！

非常感謝您的幫助！享受例如：

test.xhtml：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml" 
     xmlns:h="http://xmlns.jcp.org/jsf/html"> 
    <h:head> 
     <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> 
    </h:head> 
    <h:body> 
     <h:outputText value="The language is: #{beanTwo.language}" /> 
    </h:body> 
</html>

BeanOne.java：

import java.io.Serializable; 
import javax.enterprise.context.SessionScoped; 
import javax.inject.Named; 

@Named 
@SessionScoped 
public class BeanOne implements Serializable { 
    private String language; 

    public String getLanguage() { 
     return language; 
    } 

    public void setLanguage(String language) { 
     this.language = language; 
    } 
}

BeanTwo.java：

import java.io.Serializable; 
import javax.enterprise.context.RequestScoped; 
import javax.inject.Inject; 
import javax.inject.Named; 

@Named 
@RequestScoped 
public class BeanTwo implements Serializable { 
    @Inject 
    private BeanOne beanOne; 

    public String getLanguage() { 
     this.beanOne.setLanguage("de"); 
     return this.beanOne.getLanguage(); 
    } 
}

來源

2014-12-15 17:11:29 Socrates

從@RequestScoped類訪問@SessionScoped類？

回答

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